error diffusion
The slight change of adjoining pixels to average pixel values. This smooths an area and eliminates the graininess of a digital image.
escapement the side by side placement of type characters to form a line.

Escher
Maurits Escher (1898-1972) was a Dutch graphic artist, most recognized for spatial illusions, impossible buildings, repeating geometric patterns (tessellations), and his incredible techniques in woodcutting and lithography. I like his work a lot so his appearance in this dictionary is just an excuse to show one of his magnificant creations.

Escher-Grad
The Montreal, Quebec Canada-based developer and manufacturer of large format precision imaging systems for the electronics and graphic arts industries.

ESQ
Abbreviation for Enhanced Screen Quality: Monotype’s term for its TrueType fonts that have been very carefully hinted.

ESC
Abbreviation for ESCape.

exception dictionary
In page composition, a resident list of words that cannot be hyphenated correctly using the available hyphenation algorithm. A user defined exception dictionary contains words that a user wants to hyphenate differently than the hyphen points suggested by the algorithm.

exclamation mark

expansion board
A plug-in circuit board used to expand the functions of a computer.

expansion bus
Electronic plugs or connectors inside the computer where expansion boards can be added

expert font
An additional font designed to accompany a standard font, providing a range of characters not included in the standard character map like ligatures, small capitals, old-style figures, etc. Expert fonts are just about useless without their companion standard fonts.

expert system
A computer controlled system that executes functions normally requiring the decision making ability of someone with a particular skill

export
To output data in a format that can be read by another software application

exposure level
The quantity of light that is allowed to act on a sensitized material, such as film, paper or plate, or an electronic sensor, such as CCD

exposure
The amount and duration of illumination striking a sensitized material, such as film, paper or plate, or an electronic sensor such as a CCD.

extended
In typesetting, fonts that have broadened character, widths, but no increase in height. Extended is the opposite of compressed. Sometimes referred to as expanded.

extended type
A wider version of a regular typeface

extension
A small utility for the Macintosh operating system, that gives the operating system new capabilities. Some applications like PhotoShop or Acrobat support a similar kind of tools which are called plug-ins.

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